Preamble Puncture Timing Alignment for WLAN Symbol Interference
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Solution Overview
Problem
In wireless communication systems, preamble puncture transmission causes interference between symbols on punctured and puncture transmission channels, leading to low decoding performance at the receive end.
Innovation Solution
A preamble puncture transmission method aligns symbols on punctured and puncture transmission channels in time by using symbol boundary detection algorithms, such as mid-packet detection, to reduce interference and improve decoding performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If preamble puncture transmission is used to transmit data on available subchannels while avoiding punctured subchannels, then transmission continuity is improved, but interference between symbols on punctured and puncture transmission channels increases
Solution Approach 1:
The patent applies preliminary action by performing symbol boundary detection and timing alignment before the actual data transmission. The receive end detects the symbol boundary of the interfering signal in advance, and the transmit end pre-aligns its symbol timing with the punctured channel symbol boundaries. This preliminary timing synchronization prevents interference from occurring during the main data transmission, thereby maintaining transmission continuity while reducing symbol interference.
2Reliability
If symbol timing alignment is performed to reduce interference, then decoding performance is improved, but system complexity increases due to additional detection algorithms
Solution Approach 1:
The patent applies the taking out principle by extracting only the essential timing alignment information from the interfering signal. Instead of implementing complex full-signal processing or advanced interference cancellation algorithms, the solution extracts merely the symbol boundary timing information from the punctured channel signal. This selective extraction achieves the necessary timing synchronization for interference reduction while keeping the detection algorithm relatively simple and avoiding excessive system complexity.
Data Source
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AI summary
This application relates to the field of wireless communication, and in particular, to a preamble puncture transmission method and a related apparatus. For example, this application is applied to a wireless local area network supporting the 802.11be standard. The method includes: generating a PPDU, and sending the PPDU in a preamble puncture mode. A bandwidth of the PPDU includes a punctured first channel. A difference between a sending start moment of a first symbol transmitted on the first channel and a sending start moment of a start symbol of a data field or an LTF in the PPDU is less than or equal to a guard interval of the first symbol. It should be understood that when the difference is equal to 0, a sending start moment of the start symbol of the data field or the LTF in the PPDU and a sending start moment of the first symbol transmitted on the first channel are the same. According to embodiments of this application, interference caused by a symbol transmitted on a punctured channel to a symbol transmitted on a puncture transmission channel can be reduced, and decoding performance of a receive end can be improved.